Memory card capacity

15 pts.
Tags:
Memory cards
Most memory card buyers do not understand what to buy? 16-32-64 and now 132gb.  I would like to express capacity in number of average books they would hold etc. or some easy way to explain the quantity they think they need....etc.
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How Much Data
Is That?

Note: The information shown below uses measures
only associated with data. For example, a kilo-anything is 1000 . . . except
that when it is a kilobyte, it is 1024, an even power of two.

Whenever we discuss quantities of
data, we tend to do it in the abstract. We speak of a kilobyte, or a megabyte or
a gigabyte without really knowing what it represents.

The following table shows various
quantities of bytes, in each power of ten. Usually, they are shown with
multiples of 2 and 5 also. For example, 1 Kilobyte, 2 Kilobytes, 5
Kilobytes.

All the examples are
approximate and are rounded. For example, a computer card has 80
columns. If 50 columns contain data on a card, then two cards will be 100 bytes.
Also, a 3-1/2 inch diskette can contain 1.4 Megabytes. Showing it as 1 Megabyte
reflects both (a) the diskette not typically being filled and (b) rounding.
Finally, a CD-ROM can hold more than 500 Megabytes. However, it is listed at
that level as “typical” and as the closest match.

Bytes (8 bits)

  • 0.1 bytes: A single yes/no
    decision  (actually 0.125 bytes, but I rounded)
  • 1 byte: One character
  • 2 bytes:
  • 5 bytes
  • 10 bytes: One word (a word of
    language, not a computer word)
  • 20 bytes:
  • 50 bytes:
  • 100 bytes: Telegram; two punched
    computer (Hollerith) cards
  • 200 bytes:
  • 500 bytes:

Kilobyte
     1,024
bytes; 210;
     approx. 1,000 or 103

  • 1 Kilobyte: Joke; (very) short
    story
  • 2 Kilobytes: Typewritten
    page
  • 10 Kilobytes: Page out of an
    encyclopedia
  • 20 Kilobytes:
  • 50 Kilobytes: Image of a document
    page, compressed
  • 100 Kilobytes: Photograph,
    low-resolution
  • 200 Kilobytes: Two boxes (4000)
    punched computer (Hollerith) cards
  • 500 Kilobytes: Five boxes, one case
    (10,000 of punched computer (Hollerith) cards

Megabyte
     1,048,576
bytes; 220;
     approx 1,000,000 or 106

  • 1 Megabyte: Small novel; 3-1/2 inch
    diskette
  • 2 Megabytes: Photograph, high
    resolution
  • 5 Megabytes: Complete works of
    Shakespeare; 30 seconds of broadcast-quality video
  • 10 Megabytes: Minute of
    high-fidelity sound; digital chest X-ray; Box of 3-1/2 inch diskettes
  • 20 Megabytes: Two boxes of 3-1/2
    inch diskettes
  • 50 Megabytes: Digital mammogram
  • 100 Megabytes: Yard of books on a
    shelf; two encyclopedia volumes
  • 200 Megabytes: Reel of 9-track
    tape; IBM 3480 cartridge tape
  • 500 Megabytes: CD-ROM

Gigabyte
    
1,073,741,824 bytes; 230;
     approx 1,000,000,000 or
109

  • 1 Gigabyte: Paper in the bed of a
    pickup; symphony in high-fidelity sound; broadcast quality movie
  • 2 Gigabytes: 20 yards of books on a
    shelf
  • 5 Gigabytes: 8mm Exabyte tale
  • 10 Gigabytes:
  • 20 Gigabytes: Audio collection of
    the works of Beethoven; five Exabyte tapes; VHS tape used to store digital data
  • 50 Gigabytes: Library floor of
    books on shelves
  • 100 Gigabytes: Library floor of
    academic journals on shelves; large ID-1 digital tape
  • 200 Gigabytes: 50 Exabyte
    tapes

Terabyte
    
1,099,511,627,776 or 240;
     approx. 1,000,000,000,000 or
1012

  • 1 Terabyte: Automated tape robot;
    all the X-ray films in a large technological hospital; 50,000 trees made into
    paper and printed; daily rate of EOS (Earth Orbiting System) data (1998)
  • 2 Terabytes: Academic research
    ligrary
  • 10 Terabytes: Printed collection of
    the U. S. Library of Congress
  • 50 Terabytes: Contents of a large
    mass storage system

Petabyte
    
1,125,899,906,842,624 bytes or 250
     approx.
1,000,000,000,000,000 or 1015

  • 1 Petabyte: 3 years of EOS data
    (2001)
  • 2 Petabytes: All U. S. academic
    research libraries
  • 20 Petabytes: 1995 production of
    hard-disk drives
  • 200 Petabytes: All printed
    material; 1995 production of digital magnetic tape

Exabyte
    
1,152,921,504,606,846,976 bytes or 260
     approx.
1,000,000,000,000,000,000 or 1018  

  • 5 Exabytes: All words ever spoken
    by human beings.

Zettabyte
    
1,180,591,620,717,411,303,424 bytes or 270
     approx.
1,000,000,000,000,000,000,000 or 1021

Yottabyte
    
1,208,925,819,614,629,174,706,176 bytes or 280
     approx.
1,000,000,000,000,000,000,000,000 or 1024

Discuss This Question: 3  Replies

 
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  • TheRealRaven
    And is that somehow causing a problem? If it is, what is the problem?
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  • RICHZIT
    The problem is when the average person asks what flash drive should I buy or what media card do you think I need while standing in front of row up row of a variety from 16gb - 32gb - 64gb - and now 132gb.  You may think it is a problem, but try to explain this poor women or man after you ask what are you going to use them for? And have to listen to an answer that means nothing in terms of size....

    15 pointsBadges:
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  • TheRealRaven
    The only rational answer is to advise them to buy whichever ones they feel comfortable paying for.

    Often, the smallest/cheapest is all that's needed for a non-pro user. Larger ones can be good IF the price-point remains comfortable. But then, after some experience, they can choose to buy larger, more expensive ones if ever needed. They'll gain enough background knowledge to know "This one holds four (or whatever) times as much as the one you have," and it only cost a few dollars to learn from the first one. It's even possible that the next purchase can cost less than the first if price drops are enough.

    Trying to fit some thought like '100 books' or '20 movies' into the concept is okay in the beginning, but it's clearly just fluff without a clear picture of actual intended usage patterns. Unfortunately, non-pros usually really can't predict future usage. A purchase recommendation can be adjusted for whatever info is provided by a customer.

    By recommending smaller/cheaper combined with comfortable price, sales good-will is likely. A later, second purchase is a reasonable possibility, as is parallel purchases for other items.

    "How much does it hold?" can depend on too many factors. How big are the books? Pure, simple text? Do they contain many pictures? What resolution? What about music? Videos? Hard to say... what's the encoding? What's the bit-rate? There simply is no way to answer the question without a significant background.
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